File:Humboldt gasmask 1799.jpg
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Summary
| Description | Humboldt's first gasmask |
| Date | |
| Source | English Wikipedia; scanned from: HUMBOLDT, Alexander von. Ueber die unterirdischen Gasarten und die Mittel ihren Nachtheil zu vermindern. Ein Beytrag zur Physik der praktische Bergbaukunde. Braunschweig, Friedrich Vieweg, 1799. 8vo. With 3 engraved folded plates. |
| Author | Alexander von Humboldt |
| Permission (Reusing this file) |
public domain |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:24, 11 July 2006 | | 552 × 610 (146 KB) | Sakvaka | {{Information |Description=Humboldt's first gasmask |Source=English Wikipedia |Date=1799 |Author=Alexander von Humboldt |Permission=public domain |other_versions= }} |
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